Drill-sharpener.



PATENTED JUNE 12, 1906.

C. W. ATKINSON.

DRILL SHARPENER.

APPLICATION FILED AUG. 29, 1905.

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- Witnesses WL/b UNITED STATES PATENT OFFICE.-

Specification of Letters Patent.

Patented June 12, 1906.

Application filed August 29, 1905. Serial No. 276,274.

To all whom it may concern:

Be it known that I, CLARENCE W. ATKIN- SON, a citizen of the United States, residing at Jamestown, in the county of Boulder and State of Colorado, have invented new and useful Improvements in DrillSharpeners, of which the following is a specification.

My invention has reference to drill-sharpeners; and it contem lates the provision of a simple device throug the medium of which drills may be expeditiously and thoroughly sharpened with but a minimum amount of effort on the part of the operator of the device.

The invention will be fully understood from the following description and claims when taken in connection with the accompanying drawings, forming part of this specification, in which igure 1 isa side elevation of the device constituting the present and preferred embodiment of my invention. Fig. 2 is a top plan view of the device. Fig. 3 is a longitudinal vertical section of the device, and Fig. 4 is a transverse section taken in the plane indicated by the line 4 4 of Fig. 3.

Similar letters designate corresponding parts in all of the views of the drawings, referring to which B is the casing of which is designed to be to a suitable support. made of suitable metal top with an opening a in one of its ends, with a play-space b for the eccentric cam, presently described, and in the side walls of the said space I) with lower and upper guideways c and d. In the opposite end of the casing B, with reference to the space I), is located a die member O. This die member is fixed with respect to the casing and comprises an end my novel sharpener, arranged on and fixed The said casing B is and is provided in its abutment e, the inner side f of which is concave in horizontal section and is inclined upwardly and inwardly, Fig. 3, and a portion g, which extends inwardly from the said abutment and is provided in its upper side with a channel it of V shape in cross-section, for a purpose hereinafter set forth.

D is a movable die member designed to cooperate with the fixed member O, and E is an eccentric cam which is employed to move the said die member D inwardly or toward the abutment e of the member O. The movable die member D is provided with an upwardly and inwardly inclined forward end is of concave form in horizontal section, and it is also provided with a lower forward portion Z of V shape in cross-section, arranged to move to and fro in the V-shaped channel of the member O. Said member D is further provided with lower and upper cross-heads m 72., disposed in the guideways c and (1, respectively, whereby it is guided in its inward and outward movements. The eccentric cam E is arranged back of and in engagement with the die member D and is fixed on a transverse shaft F, which is journaled in the casing and is designed to be turned through the medium of a lever-wrench G or other suitable means.

The manner of using my improved sharpener is as follows: After the drill to be sharpened is heated to a sufiicient extent its end is seated in the V-shaped channel or groove of the fixed die member O, and it is struck a number of blows with a hammer or the like, when, as will be readily appreciated, the end of the bit will be widened and provided with an edge. The lever-wrench G is then moved in the direction indicated by arrow in Fig. 1, so as to turn the eccentric cam E and move the die member D in the same direction, when the said die member D will cooperate with the fixed die member O to press the bit to the proper gage and shape.

It will be gathered from the foregoing that with my novel device a drill or drill-bit may be quickly and thoroughly sharpened with the expenditure of but a minimum amount of effort on the part of the operator; also, that the device is simple and compact in construction and embodies no parts likely to get out of order after a short period of use.

The movable die member D is preferably, though not essentially, provided on its upper side with a graduated scale or gage, as shown in Fig. 2.

The aperture t (best shown in Fig. 3) is for the removal of any scales or dirt that may be deposited in the channel h.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a drill-sharpener, the combination of a casing, a die member fixed with respect to the casing and comprising an end abutment the inner side of which is concave in crosssection and is inclined upwardly and inwardly and a portion extending inwardly from the said abutment and having a channel, of V shape in cross-section, in its upper side, a die member movable in the casing to- ICO ward and from the abutment of the firstmentioned member and having an upwardly and inwardly inclined inner end, of concave form in cross-section, and also having a lower forward portion, of V shape in cross-section, arranged to move in the channel of the firstmentioned member, and suitable means applied to the last-mentioned member for moving the same inwardly.

- 2. In a drillsharpener, a movable die member having a lower forward portion of V shape in cross-section, and means for moving said die member; in combination with a fixed die member having an end abutment and also having an inwardly-extending portion in which is a channel, of V shape in cross-section adapted to serve the twofold function of guiding the movable die member and giving an edge to a drill end seated therein and subjected to blows.

3. In a drill-sharpener, the combination with a casing having an opening in its top and also having lower and upper, longitudinal guideways in its side walls, a die member fixed in the casing and comprising an end abutment the inner side of which is concave forward portion, of V in cross-section and is inclined upwardly and inwardly and a portion extending inwardly from said abutment and having a channel, of V shape in cross-section, in its upper side, and a die member movable in the casin toward and from the abutment of the rstmentioned member and having an upwardly and inwardly inclined inner end, of concave form in cross-section, and also having a lower shape in cross-section arranged to move in the channel of the firstmentioned member, and also having crossheads movable in the lower and upper, longitudinal guideways of the casing; of an eccentric cam mounted between the casing and arranged when rotated to move the second-mentioned die member inwardly, and a lever fixed with respect to the said eccentric cam.

Intestimony whereof I have hereunto set my hand in presence of two subscribing wit- DGSSGS.

CLARENCE W. ATKINSON. W'itnesses:

W. B. CLEMENS, FRED W. BURGER.

the side walls of 

